Fatally missing resgistry entries

[17:38:59] [Server thread/WARN] [net.minecraft.server.MinecraftServer]: Can't keep up! Did the system time change, or is the server overloaded? Running 2217ms behind, skipping 44 tick(s)
[17:44:36] [Netty Server IO #3/INFO] [FML]: Client protocol version 2
[17:44:36] [Netty Server IO #3/INFO] [FML]: Client attempting to join with 6 mods : [email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
[17:44:36] [Netty Server IO #3/INFO] [FML]: Attempting connection with missing mods [spongeapi, sponge, spongeforge, carrotshop, commanditems, dailyrewards, pixelmoneconomybridge, griefdefender, gts, holograms, huskyui, impactor, legendaryplus, dosmike_lockette, luckperms, mmcrestrict, nofall, nucleus, chatpixel, pixelextras, pixelmonplaceholders, placeholderapi, playtimecounter, pjc, pjw, protocolcontrol, skinsrestorer, tabmanager, totaleconomy, worldedit] at CLIENT
[17:44:36] [Server thread/INFO] [net.minecraft.network.NetHandlerPlayServer]: Ygtt lost connection: Disconnected

can anyone help me?

It also says:

[18:03:08] [Server thread/INFO] [net.minecraft.network.NetHandlerPlayServer]: Ygtt lost connection: Internal Exception: io.netty.handler.codec.EncoderException: java.io.IOException: Can't serialize unregistered packet
[18:03:53] [Netty Server IO #7/INFO] [STDOUT]: [skinsrestorer.shared.utils.MojangAPI:getUUIDMojang:153]: [SkinsRestorer] Trying Mojang API to get UUID for player fuxi.